Thermostatic electric switch for flatirons and the like



I C. S. FAY. THERMOSTATIC ELECTRIC SWITCH FOR F'LATIRONS AND THE LIKE.

APP LICATION FILED OCR 4, I919.

Patented Aug. 2, 1921.

I I: r

FIG. 2.

INVENTOR. CLARE/vac 5. FA Y ATTORNEYS.

2 UNITED. "STATES P-ATENT OFFICE.

CLARENCE S. FAY, 01 LOS ANGELES, CALIFORNIA.

'I'HEBIOSTATIC ELECTRIC SWITCH FOR I'LA'I'IRONS AND THE LIKE.

To all whom it may concem 7 Be it known that I, CLARENCE .S. FAY, a

citizen of the United States, residing at Los Angeles in the county of Los Angeles and State of California, have'invented new and useful Improvements in Thermostatic Electric Switches for Flatirons and the like, of which the following is a specification.

My object is to make a thermostatic electric switch .for flat irons and the like, and my invention'consists of the novel features herein shown, describedand claimed.

Fi re 1 is a side elevation of a' fiat iron provided with a thermostatic electric switch in accordance with the rinciples of my invention, parts being broEen awa and shown in section to show the details 0 the switch.

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1 and'looking' downwardlyv as indicated by the arrows.

Fig. 3 is a bottom plan view of the switch and a diagram of the electric circuit, as seen looking in the direction indicated by the arrow 3'in Fig. 1.

Fig. 4 is an enlarged fragmentary sectional detail of the snap feature of the switch, the view being taken on a plane parallel with Fig.3 and on the line 4-4 of The flat iron 1 has a heating chamber 2 and an electric heating element 3 is mounted in the heatin chamber '2 in the usual way. The body 0 the fiat iron 1 is past with an opening 4 at the center of-its top. A plate 5 is fitted to cover theopening 4 and secured in place by screws 6 and the thermostatic switch 7 is mounted upon the lower face of the plate 5.

The details of the thermostatic switch 7 are as follows:

A post 8 extends downwardly from the plate 5, a thermostatic element 9 is rigidly xed at one'end of the post 8 and extends in a curve substantially once around the post 8 and some distance from the .post and has fork tines 10 andll at its-free end, the ad'acent inner faces ofthe latter being covere with suitable insulatin material such as hard rubber or fiber. ee Fig. 3.) The thermostatic element 9' is made of two'strips of metal having different co-eflicient's of ex-,

pansion. a

The thermostatic switch blade 12 is mounted upon a plvot 13 and one end of the blade 12 fits between the insulated faces of the tines 10 and 11 so that as the thermostatic Specification 01' Letters Patent. Patented Aug. 2, 1921. Application filed. October 4, 1919. Serial No. 328,580. 4

socket 20 with a blade 21 having a contact 'point 22 in position to be engaged by switch blade 12. A plate 23 is electrically the connected to the switch blade 12 and the line 24 connects the plate 23 to one end of the electric heating element 3 and the other end of the electric heating .element 3 is connected to the terminal 25 in the socket'20.

. When the flat iron iscold the tension of the thermostatic element 9 will snap the point 17 .past the point 16 and swing the blade 12 a ainst the contact-.22 to close the circuit, an then if the cord plug 26 is in the socket 20 and the line 27 electrlfied the flat iron will heat until the temperature reachesa predetermined degree, whereupon the expansion ofthe thermostatic element 9 will swing the switch blade 12 away from the con.- tact 22 and snap the point 17 past the point 16 thereby openin the circuit andconsequently stopping t e heating operation.

' Various changes may be made without departing from the spirit of my invention as claimed.

I claim: a

1. A thermostatic switch for flat irons and the like, comprising a plate, a post extending from the plate, a thermostatic element connected to the post, a pivotally mounted switch blade, one end of said switch blade being flexiblyconnected to the thermostatic element, a contact point in position to be engaged by the switch blade when the therbase, a convolute thermostatic element'fixed.

at its inner end to the base, an electrically enf ivotally mounted on ergized switch blade the base, one end of w ich is engaged by the outer' free end oftsaidelement, its opposite 2. A thermostatic switch compirsing a and normally engaging an electrically energized contact, and means to securely hold said switch blade positively in and out of engagement with said contact when it is oscillated by expansion of the thermostatic element.

3. A thermostatic switch comprising a base, a convolute thermostatic element fixed at its inner end to said base, an electrically energized switch blade pivotally mounted on said base and adaptedto be oscillated by the expansion and contraction of said element, one end of said blade adapted to engage the outer free end of said element, the opposite end normally enga ing an electrically energized contact resilient means to positively hold said blade in or out of contact with its contact, said means comprising a pointed cam mounted on the blade, said point adapted to engage a leaf spring mounted on the base.

4. A thermostatic switch comprising a base, a convolute thermostatic element, constructed of two strips of metal having different coefficients of expansion, fixed at its inner end to said base, an electrically energized switch blade pivotally mounted on said base and adapted to be oscillated by the expansionand contraction of said element, one end of said blade adapted to engage the outer free end of said element, the opposite end normally engaging an electrically energized contact, resilient means to positively hold said blade in or out of contact with its contact, said means comprising a pointed cam mounted on the blade, said point adapted to engage a leaf spring mounted on the base.

In testimony whereof I have signed my name to this specification.

CLARENCE S. FAY. 

